Switching electric currents.



PATENTED JUNE 16, 1908.

S. W. MAUGBB.

SWITCHING ELECTRIC GURRENTS.

APPLIOATION FILED JUNE 26,1902.

3 SHEETS-SHEET l.

j' eases I Inventor 5am ue! Mauger No 890,783. v PATENTE D JUNE 16, 1908.

S. W. MAUGBR.

SWITCHING ELECTRIC GURRENTS APPLICATION FILED JUNE 26,1902.

'3 SHBETS-SHEET 2.

Fig.2.

Witnesses. irfiventor.

I Samuel W.Mauger*. M Mp No, 890,783, PATENTED JUNE 16, 1908.

S. W. MAUGER.

SWITGEING ELECTRIC GURRENTS.

APFLIGATION TILED JUNE 26,1902.

3 SHEETS-SHEET 3.

UNITED STATES -:;-1

QCTADY,

.EEW YGRY, ASSIGNOR TO Gm? v. MAUGER, OF SCHE? 'UEL E33" YORK.

SAM

liwtisn filed June 28;

ed. 2 respond eratlon' of these several switches selective so which they are adapted.

much-largeroverload it is desirable to protect thesefeeder switches andv to insure the that in case of an ordinary overload only the several feeder switches which are overloaded may be tripped, and may be relied upon to act with safety within the current limits 'for But in case of a simultaneous operation of a second 3 and larger switch which is adapted to carry such overload. I therefore insure by the arrangements of my invention. that in case of a severe overload such as might endanger the feeder switch, or other apparatus in circuit, the group Svibcllf: behind it will also be tripped, and in case of a still greater overload the main switches 3 will be tripped thus isolatlng the generators on their several bussectlons, those actions being rcrulercd selective so that the dangerous over-load will be caused to act more promptly than. smaller overloads. ll ellect this desirable result by means of anelcctro-ri= u onsive device governed by the load on the enders and acting in case of a n'iinim'um o: css ol' overload to close a direct currrmt circuit through the trip-coil of the feeder switch; but in case of tho higher overloads closing the circuit through the trip-coils ol the group or main switches respectively.

' 8-8'"-- represent series transl'oriners connected in enough leads of the feeder circuit to insure the tripping oi" the switches in casc'of an overload on any load. By way of examplc a triphasc system is shown in the drawlng, this however being merely for the sake of illustration, and therefore two transformers are employed, by'roason of which, if an overload exists on any branch of the circuit some one transformer will be affected. The second aries of these transformers are connected in circuit each with two relays 99 and l0- 10, the armatures of which, when the relays aresufiicien'tly energized, free time limit do inces which are diagrammatically represented in the drawing by disks 90, no, .100 and 100 having contact surliaecstll, 9i 1'0 1 and 101" which cooperate with the .lixed contacts 92, 92, 102-, 102 to close a local circuit, as indicated in the diagrs. The relays have been shown merely as solenoids the cores of which are. drawn backward when they are 13' those for the main bus-bar switclics. The tr pping circuits are all fed from a limit than the coinpanionfrelcys overexcited and free the disks so that they 65 are free to rotate and bring the two relay contacts into engagement.

11l1 represent the trip-coils for the feeder circuit-breakers or switches, lf those for the group switches, and iii- 10 .il. direct-current machine il -1, and bus-bars supplied thereby. In event the parts are so arranged that the relays 9-1U-9-1-l-U close their local circuits under di strengths of cur-rent in the distr n: feeder. 'lhi is indicated in the dia ra. the relative number of turns of the elflfi windings. Assuming that the inininunnv so overload for which the circuit is to be broken occurs the relay 9 or 10 will. be all'eclcd. irri spective of the leg of the circuit which ni be overloaded, since one onthe other ,1: transl'oru'lers will act. in either case th re lay 9 or 10 operates arn'niture and all v definite time interval closed a local. circuit from the exciter lei over wire 15, cross-con nection '16, wire 17, tripcoii 11 and. wire 551 thereby tripping the feeder switch. on

The relative time intervals are represented diagrummatical]y by the rela tive distances hetween the contacts on the disks and their respoctivc fixedcontacts. Many forms of time limit devices exist which may be employed. One form Well adapted for mypurposc iown and described in Patent No. 832,577, gi'i'z'tllicd Oct. 2, 1906, to E. M. Hewlett. Such a type is shown in Fig. 2 ol' the drawings in which J, 9 represent the richly coils suppliral by the transformers, 8, 8; either ol' the arnntturcs 30, 30 may release a clock t sin, which will slowly rotate a circuit closing disk which carries a segment l vhen either armature is attracted contact 32 is raised in path of segment 31, and if the ovcrlrmi. the segment will at end of the tim bridge contacls 32, 32 and energize he. err-- cuit containing the trip coil. if on the other hand the overload should cease before the time expires, contact 32 will fall away from the disk and thus the trip circuit cannot be Iii] closed when the segment reaches'a bridging lation to the bridge piece when t e cloclo' work is at rest. n case of' a greater oven load occuring on the feeder, one or the other of the relays 910, which are set fr higher overload, will be operated. 'll :ing device of this is preferably set that the'higher current will not occur" dangerous time interval. M by the predeter. these relays-cioses citcr 1&- over the load group switch, wires 28 25 breakers and res bar circuit-breakers, group circuit-breakers and feeder circuit breakers in series relation,

and electro-responsive devices for tri ping the feeder circuit-breakers alone, the eeder 5 and group circuit-breakers together, or all three together at different predetermined J Ioverloads.

9. An electric supply station provided with a source of current-supply, automatic 1Q busbar circuitbreakers, group e1rcuitbreakers and feeder cirduit breakers in series rality of feedercircuit-breakers fed through each grou circuit-breakers, and-time-limit relays of s orter time value for the heavier onsive to difi'erentpredetermined overloa s. I r 11. An electric suppli y station provided with feeder circuit-brea ers, group circuitbreakers fed in series through a sectional busso bar, each of suitable capacity for its normal between theseveral bus-sections, series transformers adapted to trip the feeder or both the feeder and group circult-breakers at difierent' 35 redetermined overloads, the tripping devices 1 or the feeder breakers alone having a longer one set to trip under OVEtIlOILti 'circuitbreakers sinuiitaneous a plurality of generator 'trip under'overload after a time inte time-limit, and series transforir f ping the hue-section breaker in u. time limit on a still more excessive oven 12'. In a system of distribution, the cor nation with a generator, of a feeder com? a ed thereto, two circuit-breakers eonnecto 12 series between the generator and the feeder time interval, and means for greater overload after e. shorter time in val.

13. An eleetric supply having different sections let erators, feeders supplied from or. L circuibbreakers between. the hu -hare feeders tripping under overload. after tn interval, and circuit-breakers between Sitit sections tripping under excessive overload after a shorter time interval.

14. In a system of distribution, the co nation with a generator anda feeder con ed thereto, of a feeder circuit-brealzer e second circuit-breaker between the f circuit breaker and the generator, and n for tripping both"cir cuit-breakers sirnrn .a-

neously under greater overload after a I V 'shorter time interval.

load, a plurality of circuit-breakers 1n SGIIGS 4 In witness whereof I have hereunto my hand this 24th day of June, 1902. v I v 1 SAMUEL W. MAUG'ER.

Witnesses BENJAMIN B. HULL, HELEN Om ono. 

